Stop mechanism for graphophones.



L). L. SCALBOM.

STOP MECHANISM FOR GR'APHOPHONES.

2 SHEETS-SHEET I.

h w APPLICATION FILED FEB. 15. I9l3- 1,17,?19? Patented Feb. 8,

I Ililllllllllll llllllllli' will ,A W AA mom/tzm/ 0. L. SCALBOM. I STOP MECHANlSM FOR GRAPHOPHONES APPLICATION FILED FEB. 15? 1913.

Patented Feb. 8, 191 6 '2 SHEETS-SHEET Z.

OSCARL. SCALBOM, OF G-LENVIEVV, ILLINOIS. I

STOP MECHANISM FOR GEAPHOPI-IONES.

Specification of Letters Patent.

Patented Feb. 8, 1916.

Application filed February 15, 1913. Serial No. 748,605.

T 0 all whom it may concern Be it known that I, OSCAR LABS SoALBoM, a citizen of the United States, and a resi-' dent of Glenview, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Stop Mechanisms for Graphophones, of which the followingis a specification.

My present invention relates in general to sound reproducing devices and more particularly to devices of this class employing a record member having a groove, a reproducerneedle, and driving mechanism for moving the record relatively to the reproducer needle, and, has special reference to the provision of improved means for stopping the movement of the record relatively to the needle, at the-time the reproduction of the record is completed.

I am aware that it has heretofore been proposed to automatically cut off the driv ing mechanism of phonographs upon completion of the reproduction of the record,

- such cut off devices, however, being directed to controlling the driving mechanism directly, instead of acting "upon the record member or its support as proposed by me.

' The principal objects of my present invention are the provision broadly of improved means acting directly upon the record member or its support for stopping the movement thereof upon completion of the reproduction of' the record; the provision of means controlled by the movement of the record member for stopping the movement thereof upon completion of the reproduction of the record; the provision of braking means acting directly upon the record member or its support for stopping the movement thereof upon completion of the reproduction of the record; the provision in a graphophone of braking mechanism acting upon the record and means for actuating said braking mechanism controlled by guide means carried by the record; the provision in an apparatus of the character referred to of re'sihent braking mechanism whereby the movement of the record member may be gradually cut off without shock to the reproducing mechanism; the provision of means for formingthe controlling guide on' the record member; the provision of means for preventmg abrasion of the record center; together with 4 such further objects as may hereinafter appear.

In attaining the stated objects and such additional benefits and advantages as may be below disclosed I have provided a construction illustrated in the accompanying drawings, wherein- I Figure 1 is a plan view of a phonograph embodying my present improvements in a preferred form; Fig. 2 is' a side elevational view of the structure of Fig. 1 from the left hand side; Fig. 3 is a sectional view taken on the line IIIIII of Fig. 1, illustrating details of the brake mechanism; Fig. l is a sectional view taken on the line IV -IV" of- Fig. 8; Figs. 5 and 6 are respectively plan and edge viewsof means employed by me for preventing abrasion of the record center; Fig. 7 is a plan view of a preferred form of means employed by me for forming':

the deflecting guide; and Fig. 8 is anedge-I wise View of the device of Fig. 7 in posi-.-

tion upon a record preparatory to forming said guide. j Referring first to- Figs. 1 and 2, it will be observed that I have here illustrated somewhat dlagrammatically a phonograph in" cluding a caslng 10, a-revoluble record supporting base 11 rotatable in the customary manner by a vertical shaft carried in a jour-' nal 12, and driven by any suitable driving mechanismcontained in-the casing 10, but not shown, a record 14 mounted on the base 11 and held in position thereon by a set screw 15, a portion 16 of a horn supported from the casing 10 by a bracket 17, and.

carrying a sound box 18, provided withwa reproducer needle 19 engaging the spiral record groove 20 of the member 1st. The

construction just described, since it is well known'in the art requires no further detailed explanatlon save in connection with- Fig. 1 it will'be observed horn, a brake device 21 adapted to act upon the record member 14, or upon its supporting base 11, and preferably upon the periphery of the member 11, such brakekdevice 21 belng provided with suitable actu-1 ating mechanism to be hereinbelow dc scribed in connection with Figs. 3 and 4; and, further, that I provide upon the record member 14 suitable guiding or deflecting means whereby the reproducer needle 19 maybe diverted from the groove 20, and

thereby deflected from its normal course of movement, carrying with it the sound box 18 and such parts as may be connected therewith, vice 21.

The preferred form of guiding or deflecting means employed by me is a groove 22 which should be positioned at the end of the record groove, and may be given the desired form in the convenient manner to be below described in connection with the device of Figs. 7 and 8, and where such a groove is used, a protecting device 23 such .as will be below described in connection with Figs. 5 and 6 may be conveniently (though not necessarily) employed to pre- Jvent abrasion of the record center and the consequent production of discordant sounds.

Referring now more particularly to Figs. -'3 and 4 wherein I have illustrated the details of construction of a brake device indicated at 21 in Figs. 1 and 2, it will be observed that inthe preferred form of brake device here shown I mount on the casing 10 a supporting base 30 carrying a pair of shoes 313l whichare pivoted for horizon vtal movement about a. center post 32 which has threaded engagement with the base 30.

Each shoe is preferably provided with a leather facing indicated at 33 adjacent the point where it bears on the rotatable support 11 to the end that when the device is actuated the rotation of the support may be stopped without shock, and each of the members 31 is further provided with extensions 34 whereby the shoes 31 may be conveniently withdrawn from contact with the member 11 preparatory to restarting the reproducing movement.

For holding the shoes 31 out of contact with the member 11 during the reproduction of the record I employ a dog 35 having. oppositely disposed catches 3535 (see Fig. I 4), such dog being carried by arms 36 pivoted at 37 to a supporting member 38 which is retained in position by the center post 32 above referred to. For sustaining the dog in such a manner that the catches 35 arein position to engage the extensions 34 when they are moved to the position shown in Fig. 4 and thereby hold the brake device 21 out of operative relation to the supporting base 11, I employ a supporting spring 39, and for normally forcing the extensions 34 apart and thereby forcing the shoes 31 into con tact with the record 11 I employ a coiled spring 40 Whose respective ends 41 (one not shown) bear against such extensions 34.

For depressing the dog'and thereby causing disengagement of the catches 35 from and thereby actuate the brake dedevice operable by the movement of the horn portion 16, in the manner to be below described, the shaft 42 having at its opposite end a preferably flat cam surface 44, contacting with the dog 35* and so arranged that any material movement of the cam and thence of the dog will withdraw the catches 35 from contact with the pieces 34 thereby releasing the brake shoes 31, which the spring 40 then forces into contact with the base 11 and stopping the movement of the record 14 carried thereby.

lVhen' my present improvements are employed in phonographs as they are commonly constructed at this day, which includes the utilization of a composition disk record member which is often provided with a papier mach center, and since my improvements contemplate the deflection of the reproducer toward such center, thereby tending towarda possibility of defacement of such center with consequent production of discordant sounds, I preferably employ the protecting disk 50 which may be a piece of thin sheet steel such as is indicated in Fig.

'5, formed with a notch 51 in the periphery of the disk in order to guide the reproducer needle 19 on to the flat surface of the disk.

In order to secure the most eflicient results from. phonographs employing my present improvements, I find it highly desirable, though not absolutely essential, that the defleeting groove 22 bear substantially the relation to the sound producing groove 20 shown in Fig. 1, that is, that the angle formed by the extension of the groove 22 with the groove 20, be substantially 15 degrees, and inasmuch as the sound reproducing groove 20 differs in. various records, ac cording to the length thereof, I have found it most desirable to provide means for insuring a constant relation between the groove 22 and the groove 20. To this end I hay e provided. the templet shown at 52 (Fig. 7 wherein I employ apiece of fiat sheet steel forming the same with a guide edge 53 and a center pin 54 for engaging the central aperture of the record 14 (see Fig. 8), the leg of the templet being provided with fa number of finger holds 56 whereby it may be easily adjusted with relation'to the end of the groove 20, and firmly held in such position while the groove 22 is being formed in any convenientmanner such as by the use of a sharp pointed scraper. Since the groove 20 is in the form of a spiral, and it is desirable to maintainthe groove 22 in a constant angle to all of the helices of the spiral 20 the form of the edge 53 of the templet 52 is preferably a curve in the nature of a portion of a logarithmic spiral.

vIn the operation of phonographs embody 'ing my present improvements, the record having been provided with suitable deflecting means, such as the groove 22, it is placed in position upon the rotatable base 11 in the customary manner and the brake device moved to the position shown in Fig. 1. Reproduction of the record will then becommenced and carried on in the customary manner until such time as the reproducer needle 19' strikes the groove 22 when it will bedelected away therefrom and up on to the disk 50,-the horn portion. 16 being carried thereby to the position indicated in dotted lines in Figs. 1 and 4, thus moving the oper ating lever 43 of the brake device 21 to the position shown in dotted lines in Fig. 4,

lowering the dog 35, and permitting the application of the brake shoes 31 to the margin of the member 11, thus stopping the movement. of the record. Upon resetting the reproducing needle in the groove 20 of the same or another record, the brake device 21 .may be released by drawing the extensions 34 together, when the action just described will be repeated.

Having thusdescribed my invention and.

illustrated-itsv use, what I claim as new and desire to secure by Letters Patent is:

1. A brake device comprising, in combina tion, a pair of oppositely disposed spring applied-brake shoes, spring held detent means for normally holding said shoes in a predetermined position, and means'for releasing said detent means whereby said brake shoes are released and may thereupon be actuated by said spring.

'2. A brakedevice, comprising, in combination, a pair of oppositely disposed members pivoted intermediate their ends, each carrying at one end a brake shoe and the opposite end being provided with spring actuating means for causing the first mentioned ends to approach, spring held detent means for normally holding said shoes in separated position, and means for releasing said detent means whereby said shoes are released and may thereupon be actuated by said actuating means.

3. A brake device comprising, in combination, a spring applied brake shoe, spring held detent means for normally holding said shoe in a predetermined position, and a cam for 'moving said detent and thereby releasing said brake shoe, whereby it may be actuated by said actuating means.

' 4. A brake device comprising, in combination, .a spring applied brake shoe, pivoted detent means for normally holding said shoe in a predetermined position,' and a cam for movingsaiddetent and thereby releasing said brakeshoe, whereby it may be actuated by said spring actuating means.

5. A brake device comprising, in combination, a spring applied brake shoe, a detent for normally holding said shoe in a predeterminedposition, a cam adapted to move said detent, and a trigger for moving said cam and thereby said. detent, whereby said brake shoe is released and may thereupon be actuated by said spring brake applying means.

6. A brake device comprising a frame, a

normally to separate said portions, a detent for holding said portions in retracted position, and apivoted arm adapted to release said detent.

8. A brakedevice comprising, in combination, a pivotally mounted brake shoe, a ver I tical pivot for said brake shoe, a detent for holding said brake shoe in retracted position, a pivotally mounted arm for releasing said brake shoe, a pivot for said arm, and a cam on said last-mentioned pivot, for moving said detent out of holding position.

9. A brake device comprising, in combination, a surface to be braked, a pivoted member, a brake shoe on the end of said member,

the distance between the braking surface of said shoe and the pivot of said member being only slightly greater than the perpendicular distance between the pivot and the surface to be braked, and a spring acting on said member adapted to press said brake shoe iinto contact'with said last mentioned surace.

10. A brake device comprising, in combination, a surface to be braked, a pivoted member, a brake shoe on the end of said member, the distance between the braking surface of said shoe and the pivot of said member being only slightly greater than the perpendicular distance between the pivot and the surface to be braked, and a spring acting on said member adapted to press said brake shoe into contact with said last mentioned surface, and releasable means for holding said brake shoe out of contact with the surface to be braked.

11. A brake device comprising, in com- .bination, a surface to be braked, apivoted member, a brake shoe URL the end of said. member, the distance beeween the braking surface of said shoe id. the pivot of said member being only snghtiy greater than the perpendicular distance betwee the pivot and the surface to be braked.

12. A brake device comprising, in CO Ilbination, a member pivoted intermediate its ends, a brake shoe at one end, a spring acting on said member adapted to press the brake shoe against the surface to be braked,-

a portion at the other end adapted to be grasped by the fingers for 111 ving said menu her in opposition to said spring, and means for releasably holding said member in such. retracted position.

13. A brake device comprising, in co1nbinatien, a pair of oppositely d1. posed men1- iJGlS pivoted intermediate their ends, each carrying at ene en 1 a brake shee and at the opposite end a no" n e iapted to be "rasped by the fingers for re .113; the brake shoes, a spring acting en said members adapted to press said brake ehees against the surface to be braked, and means for releasabiy hold-- ing said nieinbei' in retracted posit n.

In testimony whereof I have hereunto signed my in the presence of the two subscribed; Witnesses.

OSCAR L. SCALBOM.

Wit-nee as:

.E/EARTHIA W ns'rfiimn, fAUL CARPENTER, 

